<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var arr =['red', 'green','blue','skyblue','perple']
        //forEach 遍历数组 for-in  for-of
        arr.forEach(function(item,index,array){
            console.log(item, index, array);
        });
        //item 项目
        //index 索引号 
        //array数组
    </script>
</body>
</html>